Lubricating oil composition for internal combustion engine

摘要

A lubricating oil composition for internal combustion engines contains: base oil; (A) a boronated product of a polyalkenyl succinimide compound; (B) molybdenum dithiocarbamate; and (C) zinc dialkyldithiophosphate.
The component (A) is a boronated product of a succinimide compound represented by the following formula (1), and the succinimide compound is obtained by reacting (a) a succinic acid or its anhydride substituted by a polyalkenyl group with (b) polyalkylene polyamine of which 5 mol% or more of the entirety has a ring structure at its terminal. B/N ratio thereof is 0.5 or more, and a content of the component (A) is 0.01 to 0.1 mass% of the total amount of the composition in terms of boron.
The component (B) is MoDTC represented by the following formula (2), and a content of the component (B) is 0.01 to 0.08 mass% of the total amount of the composition in terms of Mo. A content of the component (C) is 0.01 to 0.09 mass% of the total amount of the composition in terms of phosphorus.
Each symbol in the above formulae means the same as described in the description.